Proposal: Lifting to TExpQ

[Simon Peyton Jones]

Indeed.  Moreover there is nothing unsafe about this, so I'd like to see this done without using unsafe-anything.

To do this, the Lift class would need to change, from

	class Lift t where
	  lift :: t -> Q Exp

to

	class Lift t where
	  lift :: t -> Q (TExp t)

This would take a bit of work, but it looks to me as if it would be a Good Thing.
Maybe someone could write up a design?   

Simon

|  -----Original Message-----
|  From: Libraries [mailto:libraries-bounces at haskell.org] On Behalf Of
|  Emil Axelsson
|  Sent: 12 January 2018 10:48
|  To: Haskell Libraries <libraries at haskell.org>
|  Subject: Proposal: Lifting to TExpQ
|  
|  Hi!
|  
|  I wasn't able to find a function like this anywhere:
|  
|     liftT :: Lift a => a -> TExpQ a
|     liftT = unsafeTExpCoerce . lift
|  
|  It seems like a nice addition that would reduce the need for
|  `unsafeTExpCoerce` in user code.
|  
|  Should it be added?
|  
|  / Emil
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